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PDF WM8912 Data sheet ( Hoja de datos )
| Número de pieza | WM8912 | |
| Descripción | Ultra Low Power DAC | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM8912 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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WM8912
Ultra Low Power DAC with Headphone Driver
for Portable Audio Applications
DESCRIPTION
The WM8912 is a high performance ultra-low power stereo
DAC optimised for portable audio applications.
The device features stereo ground-referenced headphone
amplifiers using the Wolfson ‘Class-W’ amplifier techniques -
incorporating an innovative dual-mode charge pump
architecture - to optimise efficiency and power consumption
during playback. The ground-referenced outputs eliminate
headphone coupling capacitors. The outputs include
common mode feedback paths to reject ground noise.
Control sequences for audio path setup can be pre-loaded
and executed by an integrated control write sequencer to
reduce software driver development and minimise pops and
clicks via Wolfson’s SilentSwitch™ technology.
A dynamic range controller provides compression and level
control to support a wide range of portable recording
applications. Anti-clip and quick release features offer good
performance in the presence of loud impulsive noises.
ReTuneTM Mobile 5-band parametric equaliser with fully
programmable coefficients is integrated for optimization of
speaker characteristics.
Common audio sampling frequencies are supported from a
wide range of external clocks, either directly or generated
using the integrated FLL.
The WM8912 can operate directly from a single 1.8V
switched supply. For optimal power consumption, the digital
core can be operated from a 1.0V supply.
FEATURES
3.8mW quiescent power consumption for DAC to
headphone playback
DAC SNR 96dB typical, THD -86dB typical
Class W ground-referenced headphone driver
- 28mW per channel into 30 at <1% THD
- 32mW per channel into 15 at <1% THD
Dynamic range controller
ReTune™ Mobile parametric equalizer
Integrated control write sequencer for pop minimised start-
up and shutdown
Single register write for default start-up and shutdown
sequences
On-chip FLL provides all necessary clocks
DAC supports standard sample rates from 8kHz to 96kHz
32-pin QFN package (4x4mm, 0.4mm pitch)
APPLICATIONS
Portable multimedia players
Multimedia handsets
Handheld gaming
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.1
Copyright 2013 Wolfson Microelectronics plc
1 page  
Production Data
WM8912
START-UP SEQUENCE................................................................................................................................................ 87
SHUTDOWN SEQUENCE............................................................................................................................................. 88
POWER-ON RESET...................................................................................................... 90
QUICK START-UP AND SHUTDOWN.......................................................................... 91
QUICK START-UP (DEFAULT SEQUENCE)................................................................................................................ 91
FAST START-UP FROM STANDBY ............................................................................................................................. 92
QUICK SHUTDOWN (DEFAULT SEQUENCE)............................................................................................................. 93
SOFTWARE RESET AND CHIP ID............................................................................... 93
REGISTER MAP .................................................................................................. 94
REGISTER BITS BY ADDRESS ................................................................................... 97
APPLICATIONS INFORMATION ...................................................................... 126
RECOMMENDED EXTERNAL COMPONENTS ......................................................... 126
PACKAGE DIMENSIONS.................................................................................. 127
IMPORTANT NOTICE ....................................................................................... 128
ADDRESS ................................................................................................................... 128
REVISION HISTORY ......................................................................................... 129
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PD, Rev 4.1, February 2013
5
5 Page 
Production Data
CHARGE PUMP
PARAMETER
TEST CONDITIONS
Start-up Time
CPCA
Normal mode
Low power mode
CPCB
Normal mode
Low power mode
External component requirements
To achieve specified headphone output power and performance
Flyback Capacitor
at 2V
(between CPCA and CPCB)
CPVOUTN Capacitor
at 2V
CPVOUTP Capacitor
at 2V
WM8912
MIN TYP
260
CPVDD
CPVDD/2
-CPVDD
-CPVDD/2
MAX
UNIT
s
V
V
V
V
1 2.2
2 2.2
2 2.2
F
F
F
FLL
PARAMETER
Input Frequency
Lock time
Free-running mode start-up time
Free-running mode frequency accuracy
SYMBOL
FREF
TEST CONDITIONS
FLL_CLK_REF_DIV = 00
FLL_CLK_REF_DIV = 01
VMID enabled
Reference supplied
initially
No reference provided
MIN
0.032
0.064
TYP
2
100
+/-10
+/-30
MAX
13.5
27
UNIT
MHz
MHz
ms
s
%
%
OTHER PARAMETERS
VMID Reference
PARAMETER
Midrail Reference Voltage (VMID pin)
Charge up time (from fully discharged
to +5% or -10% of VMID)
TEST CONDITIONS
External capacitor
4.7F
MIN
-3%
TYP
AVDD/2
890
MAX
+3%
UNIT
V
s
Digital Inputs / Outputs
PARAMETER
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
SYMBOL
VIH
VIL
VOH
VOL
TEST CONDITIONS
IOH = +1mA
IOL = -1mA
MIN
0.7DBVDD
0.9DBVDD
TYP
MAX
0.3DBVDD
0.1DBVDD
UNIT
V
V
V
V
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PD, Rev 4.1, February 2013
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8912.PDF ] | |
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